4 Answers
4

Check out this blog post. The author describes how to build a Twitter Sentiment Classifier with Python and NLTK. Looks like a good start, as sentiment analysis is no easy task with lots of active research going on in the field.

Here is, Combination of Semi Supervised co-occurance based and unsupervised WSD based classifier. Its in Python though. And you need nltk, wordnet, SentiWord-net and movie review corpus which comes with nltk.